Carrier 50ZH Series Product Data page 15

LEGEND
BF — Bypass Factor
edb — Entering Dry-Bulb
Ewb — Entering Wet-Bulb
kW — Total Unit Power Input
Idb — Leaving Dry-Bulb
Iwb — Leaving Wet-Bulb
SHC — Sensible Heat Capacity (1000 Btuh) Net
TC — Total Capacity (1000 Btuh) Net
*At 75°F entering dry bulb (Tennessee Valley Authority [TVA] rating
conditions); all others at 80°F entering dry bulb.
NOTES:
1. Direct interpolation is permissible. Do not extrapolate.
2. The following formulas may be used:
sensible capacity (Btuh)
t = t –
ldb edb
1.10 x cfm
UNIT FILTER
SIZE SIZE
500
50ZH (in.)
030-042 24 x 24 0.06
048, 060 24 x 30 —
ACCESSORY ELECTRIC HEAT PRESSURE DROP (in. wg)
WET COIL PRESSURE DROP
UNIT SIZE
50ZH
030
036
042
048
060
FILTER PRESSURE DROP (in. wg)
600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300
0.07 0.08 0.08 0.09 0.09
— — — — —
HEATER
kW
600 800 1000 1200 1400 1600 1800 2000 2200
5-20 0.06 0.08 0.10
t = Wet-bulb temperature corresponding to enthalpy of leaving
lwb
indoor coil (h
total capacity (Btuh)
h = h –
lwb ewb
Where: h = Enthalpy of air entering evaporator coil
ewb
3. The sensible heat capacity is based on 80°F edb temperature of air
entering indoor coil.
Below 80°F edb, subtract (corr factor x cfm) from the sensible heat
capacity.
Above 80°F edb, add (corr factor x cfm) to the sensible heat capacity.
Correction Factor = 1.10 x (1–BF) x (edb – 80).
AIRFLOW PRESSURE DROP
(cfm)
900
1000
1200
1000
1200
1400
1600
1000
1200
1400
1600
1400
1600
1800
1700
1800
2100
2300
CFM
0.09 0.10 0.11 0.12 0.14
— — 0.08 0.09 0.10
CFM
0.13 0.15 0.18 0.20
)
lwb
4.5 x cfm
(in. wg)
0.06
0.06
0.08
0.04
0.05
0.07
0.08
0.04
0.06
0.08
0.09
0.07
0.08
0.09
0.07
0.08
0.09
0.10
0.15 — — — —
0.11 0.12 0.13 0.14 0.15
0.23 0.25
— — —
0.16 0.17 0.18
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